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Hi my name is Robert......
Are you using the fridge as well on LP? The only reason I ask is on some there is a high humidity switch and if that switch is ON it will drain the batteries pretty fast if yours has that switch make sure it is off, if you are not sure get me the make and model of the fridge. You are limited when you are dry camping and need to watch how much DC voltage that you use. If the furnace is running all the time then yes it is is possible to drain the battery down quick, most likely the fridge is going and other appliances are drawing DC voltage even though they are off. You said you can charge the batteries to 12.5, that is borderline for a chrage, they should be charging to 13.8 volts. I would have an auto parts store load test the batteries for you, they can tell if they are bad or not. You will need a good deep cycle battery, if you are doing allot of dry camping you can switch to the 6 volt and do two or four batteries, if you did four 6 volt batteries you would have more of a "bank" to pull from two 6 volt batteries would also be better as they can be discharged more times as they have thicker plates. My concern is if the batteries are not getting that full charge to 13.5 + volts then you actually might shorten the life of them... IF you have more questions or concerns please feel free to contact me.... Robert
IF you would like to do a phone service there is an additional fee.... You can follow up with me as much as needed in this format. I only get credit when you select a rating. IF you would like to do the phone service I can send you the request. Robert
There is some testing that you can do to see if something else is drawing on the battery, if you like I can explain that. Also as I stated if your fridge has that high humidty switch and it is ON it will drain the batteries very fast.... Why even ask a question if you do not want help. I will request a refund for you, have a nice day.